Stop for phonographs



Aug. 14, 1923. 1,464,977

w. R. DUNCAN STOP FOR PHONOGRAPHS Filed Nov. 21. 1921 2 Sheets-Sheet 1Aug. 14, 1923.

W. R. DUNCAN STOP FOR PHONOGRAPHS Filed Nov. 21 1921 2 Sheets-Sheet 2reamed Au 14, 1923.

winner; 3. Duncan, or. emcee oi, armors,

Litter? sror ron rrronoe-alirrrs;

"Application filed. November 21, 1921. $eria1 No. 516,723.

ToaZZ whom it may concern:

Be it known that I, VVILLIAM R. DUNCAN, a citizen of the UnitedStatesyresiding at Chicago, in the county of Cook and State of Illinois,have invented certain new and usefulimprovements in Stops forrPhonofgraphs, of which the following isa specification;

This'invention relates to an automaticstop which is particularlyapplicable to phonographs or talking machines ofthe Edison type in{which a vertically vibrating I stylus coacts' with a fiat disc orrecord.-- I y .The ,objects of this invention are to pro-' videaparticularlysimple and efiicient stoplping m'echanism which may bereadily applied to machines which have been constructed or whichinay be'incorporated in new machines; toprovide an automatic stopping devicewhich will be actuated. by themovementr of a floating weight-when itreaches the end of the groove in the record; and in general to providesuch an improved construction as will be described more fully in thefollowing specification. a i r In the accompanying drawings illustrating this invention 7 Figure 1 is-a side view partially in sec 'tlOIlshowing an Edison phonograph and re my improved stopapplied'thereto; V

Figure 2 is an enlarged sectionalplan I view taken on the line 22 ofFigure 1;

Figure 3 is asection taken on j the line 33 of Figure 1;

v Figured is a side'view of the attachment in position; Figure 5 1s a sdelvlew ofthe stop shown on an enlarged scale Figure 6 is a front View;

I Figures 7 and 8 are cross sectional views;

is mounted in theiwell-known manner and carries the reproducer 12. Inthis particular form of phonograph or talking machine the reproducer isprovided with a floating weight 13 which is' carried at one end by aspring Figure 9 is-a longitudinal sectio-nalview The phonograph 10 isprovided with a" combined tone arm and amplifier 11 which the" stylus 18leaves the end of the groove and runs out on the plane :surface of therecord 19 the floating weight will always swing in 'one direction withrespect to the reproducer, such movement being limited movement of theweight which I take adva ntage of. in order to'stop the machine. Thespring l has a projection or collar 20- which rotates with the swingingmovement of the weight. I secure a finger 21 to this 'collarby means ofa clasp 22'or any other suitable mannerso that the finger will swing orvibrate with the weight-'.;;The stopping .mechanism'23 isrfiried' to'theend 15' of the reproducer so that it may be actuated'by the inner finger21. This mechanism has a base 24 with a bracket or fastening portion 25which engages with-the end 15 of the reproducerand is held by means of aset screw 26; A tube 27 extends upwardly from the base and has a plunger28 mounted there: in. The lower end of this plunger is provided with afoot 29 such asa ball of felt or the like for engagement with the recordA compression spring 30 is-inserted between the upper end of the plungerand-the cap 31 of the tube 27 and tends to press the plunger downwardly.The plunger is held in raised position" by'mean's of a pin 32 whichpasses through-the plunger andextends out through slots 83 in the sideof the tube and engages with a yoke 34:; -This yokeis pivoted at :35

to anarm 36 whichis secured to the base 24. The yoke extends beyond thepivot and i has a thumbpiece 37 which {is arranged ad-- jacenttoa'similar thumbpiece 38 on'the arm 36 so that the yoke may be raised andthe a spring compressed by pressing these thumbv operation of thisinstrumentis that when by the loop 17. It is this relatively slightv 19for stopping the rotation of the same;

pieces together; The free end ofthe yoke i is held infraised positionbya detent- 39' which engages with a catch 4'0 on a trip lever tlwhichis pivoted 'at 42 to the cap made of small pieces of hardened steel orthe like so that they will operate with little friction. The shape ofthe trip lever 41 is ing position. The lower end of this lever passesthrough a hole 43 in the base 24 and engages with one end of ahorizontal lever 44 which is pivoted at 45 to the base 24:. The

the pin orfinger 21. 7

The detent and catch are preferably [such that it will swing by gravity.to lockopposite end of the lever 44 is engaged by V e thc ipperatq q ntl h phonog p for rile a ia-e: ea rt th pe e nrgiire se e thumbpieces 37and 38 so as I to raise the plunger 28 away fro rn the disc and theplunger is held in thispositi'onby the catch 4-0. \Vhen the stylusreaches theend of the groove and passes up on the su rtace oii therecord the floating weight 13 is-swunglaterally and causes the pin 21 topress againstthe llBXQ'I; which instill-n moves :the trip lever a loutwardlv Land releaseswthe@plunger 218 @so'ithat (the felt -ballnrrfoot 29 .will; press down .against .t

l testop the-mac -n-e. Villhenrrangementnot pants anddetarls of-;c.onst-ruct1on may ,be varied for commercial purposes withoutpdeparting tromethe scope Lot-this invention and.

I therelioreL-do not -=wis11:to be limitedgtofithe ducerand adaptedtoengage with the I record exact-z constructionshown; and described, except as specified :in the tollowmgclmms. in

which i zclaiin; .7 r

a l; 1" The vfcomb'ination with ,.-,a -;-phonograpl1 for :(llSO recordshamngia i'lo atmgweight ot means .ltor stopping the mach ne land 1110--chani'e'al. imea-ns iactuated by the floating weight "for causing theist'opp'in g zn'i'eans -.to aet. i; i J rtliheicon bination with :anEdisonitalking machine, of -.astopping device secured tothe repro'clucerandiinc-an's coaoting with the *flo'a'ting weighttor actuating thestoppin'gdevie whemhe ;styl us passes from the en d vobthegroovein theaccord; v I I i The L combination with a phonograph,

Y of a spring plunger mounted on the reproforstopping the machine, meansfor holding :the plunger in raised position and means havinga floatingweight, eta-bracket ada-pt- V actuated by 1 the stylus l support forreleasing the plunger when the-stylus passes from the groove onto"the-surface lot the record.

-.4.- I he -QOml)Hlflt1QI1- with a phonograph ed to he secured tothegrep roducer, -ajspring 'lum erinsaidbracket -means' tor raisin :3 7b said plunger, a catch for holdin g the plungerin raised position, a"finger -jcg-innecte'd to; vthe "floating weight and means operated bythe "finger tor -releasingthe catch.

stopping device for phonographs havingfloating weights, comprising abase i adapted-to heisecured to the reproduce), a

tuhemounted onsaidbase, a phi'nger'fin said tube, iii-ball of resilientmaterial at the end e record and. act :as a brake of the plunger forengagement with the eaped; pring ng op es h pi er downwardly, a yokepivoted at one side of the tube, a pin through said yoke engaging withthe plunger, thumbpieces for swinging the yoke, a detent at one end ofthe yoke, a lever pivoted at the top of the tube and having av-catchfor. engagement with the detent, a finger adapted to be secured to thefloating weightitoswingtherewith'in a lat eral direction, said fingerPbeingxadapted' to actuate the trip leiier for releasing the plunger.

:6. The combination with an lldisonphd I nograph, of a. fingerlseeuredto the floating weightand-adapted to. swing laterally therewith abracket secured to the reproducer, a

tube on said :bracketr-a plunger mounted in said -bracket; a foot'o'fresilient material at the lower end of the plunger for engagement :withthe" record, a spring inthetube tending to press the plunger downwardly,a yoke pivoted -at one side of the tube and connected with the-plungertorr'aising the same, a detent on said Ry'oke,.:a trip lever pivoted:a-hovethe detent and having-a catch for engagement ':tl15-1'8W1l3h, anda horizontallGVQI' 'PIVGtQCl (to -.a bracket," one end of saidlererrbeing adapted tobe-iengaged with the:

finger for swinging the same to causethe other end-0f the lever toengage with the trip lever torreleasing the"v plunger.

7.- 21 "stop for phonographs comprising a" brake adapted toengage withthe record, a floating weight and mechanical means controlled by saidweight for a'ctua-ting the brake at a predetermined time.

'8. Inyanapparatus 0f the character set" andrneans for releasingtheplunger to-perm it it to engage with the record for stopping the-machine when the record has been finished. v I

' 7 w n-traits. Duncan.

